3D打印CoCrFeMnNi高熵合金的微观组织、室温及低温力学性能

3D Printed CoCrFeMnNi High-entropy Alloy:Microstructure and Mechanical Properties at Room and Cryogenic Temperatures

高熵合金由于其独特的微观结构、优异的性能及潜在的应用价值,近年来受到广泛关注,是一种重要的新型金属材料。本研究通过选区激光熔化技术制备CoCrFeMnNi高熵合金,并对所打印试样的物相组成、显微组织、常温及低温力学性能进行了系统分析与表征。通过优化打印参数,最终得到了具有高相对致密度、优异的常温及低温拉伸性能的试样,其抗拉强度分别达到647 MPa(298 K)和893.8 MPa(77 K)。本研究验证了选区激光熔化制备的CoCrFeMnNi高熵合金的强度和塑性均随着温度的降低而升高。

High-entropy alloys(HEAs)have been considered as a new class of metallic alloys famous for their unique microstructures,comprehensive performances and wide applications.In this study,selective laser melting technology has been utilized to fabricate CoCrFeMnNi HEA.Phases,microstructure and mechanical properties of the as-built specimens at both room and cryogenic temperatures were investigated.The optimized printing parameters and the high relative density alloy with excellent tensile properties were derived.The tensile strength was 647 MPa at room temperature and 893.8 MPa at cryogenic temperature,respectively,demonstrating good combination of strength and ductility at cryogenic temperature.